drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA

Similar to commit e10aec6 ("drm/edid: Add 6 bpc quirk for display AEO model 0."), the EDID reports "DFP 1.x compliant TMDS" but it support 6bpc instead of 8 bpc. Hence, use 6 bpc quirk for this panel. Fixes: 196f954 ("drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"") BugLink: https://bugs.launchpad.net/bugs/1749420 Signed-off-by: Kai-Heng Feng <[email protected]> Reviewed-by: Mario Kleiner <[email protected]> Cc: <[email protected]> # v4.8+ Signed-off-by: Daniel Vetter <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
MaxKrummenacher · Feb 19, 2018 · 06998a7 · 06998a7
1 parent aa0aad5
commit 06998a7
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
@@ -113,6 +113,9 @@ static const struct edid_quirk {
 	/* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
 	{ "AEO", 0, EDID_QUIRK_FORCE_6BPC },
 
+	/* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
+	{ "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
+
 	/* Belinea 10 15 55 */
 	{ "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
 	{ "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },